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Finding the Fourth Proportional to 90,872.80, 136,330.80 and 38,255.20

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Solution

The fourth proportional to 90,872.80, 136,330.80 and 38,255.20 is: 57,391.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,872.80 : 136,330.80 = 38,255.20 : x
  2. Step 2: Convert to fraction form
    90,872.80/136,330.80 = 38,255.20/x
  3. Step 3: Cross multiply
    90,872.80x = 136,330.80 × 38,255.20
  4. Step 4: Simplify right side
    90,872.80x = 5,215,362,020.16
  5. Step 5: Solve for x
    x = 5,215,362,020.16/90,872.80
  6. Step 6: Final answer
    x = 57,391.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.